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Subnetting

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Ok. Brain picking time...
As an experiment I have 4 Class C networks and need the 3rd to have access to the 1st...

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Reading the question literaly - you need a router to connect #1 and #3.

I am assuming these 'class C' networks are either classified under the classfull rules, or /24 under CIDR. Also assuming the network addresses are all different from one another!

I should add that if this is a real set of networks, rather than a paper excercise, then you don't need to rush out and buy a router - Linux/other Unixes can be used as a router fairly easily, and some versions of Windows can be coaxed into doing it.

With Windows there is the special case of ICS - this can sometimes be coaxed into doing what you want.

It depends on the routing software, but usualy you write a full line in the routing table showing the destination network address and mask and the gateway required to get to it. The TCP/IP stack software *may* do the rest. Whether it does or not is down to whether it is able to route at all. For example I seem to remember there was a early version of Win9x that by default wouldn't route, but the addition of a Registry hack made it do so.

'route print' on a Windows box shows such a table, but note that on many PCs with a PPP interface the entries on a line can be confusing, as M$ keeps changing it's mind on how to show it.

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